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The Benefit of Tick Marks on a Visual

Alex Velez lays out the case for tick marks:

Lately, I’ve noticed that more and more graphs don’t include gridlines. If it’s unclear, I believe this to be a positive trend. I, myself, rarely use gridlines, and often remove them when I find them in a graph I’m reviewing. But I don’t stop there. 

More often than not, if a chart has gridlines, it will be lacking tick marks along the axis, and possibly an axis line as well. 

Read on to see why.